Create read-only file using c++

[neoraghav]

Hi,
I want to create a log file that captures all the actions happening...anyway i got code for that from internet.
Now what i want to do is, make that file read only so that the data is not modified by external application or user.

log(char* msg)
{   
    time_t now = time(0);   
    struct tm* tm = localtime(&now);       
    ofstream out( "logfileBrandNew.log",ios::app);
   
    out << tm->tm_year << '/' << tm->tm_mon << '/' << tm->tm_mday        
        << ' ' << tm->tm_hour << ':' << tm->tm_min << ':' << tm->tm_sec
        << ": ";   
    out << msg << "\n";   
    out.close();
}